Programmable management IO pads for an integrated circuit

• US 8,086,762 B2
• Filed: 04/01/2009
• Issued: 12/27/2011
• Est. Priority Date: 10/29/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Tran, Hoang T., Baumer, Howard A.
• Primary Examiner(s): Sorrell, Eron J
• Application Number:
  US12/416,641
• Publication Number:
  US 20090252160A1
• Time in Patent Office: 1,000 Days
• Field of Search: None
• US Class Current: 710/12
• CPC Class Codes: G06F 13/4027 using bus bridges G06F13/4022 takes precedence
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: Y04S 40/00 Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them

Abstract

A multi-port SERDES transceiver includes multiple parallel and serial ports, and the flexibility to connect any one of the parallel or serial ports to another parallel or serial port. The ports include programmable pads that are capable of supporting multiple different data protocols, timing protocols, electrical specifications, and input-output functions. A management data IO pad also enables the transceiver to support different electrical requirements and data protocols at the same time. The substrate layout of the transceiver is configured so that the parallel ports and the serial ports are on the outer perimeter. A logic core is at the center, where the logic core operates the serial and parallel data ports, and the bus that connects the data ports. The bus can be described as a “ring” structure (or donut “structure”) around the logic core, and is configured between the logic core and the data ports.

Claims

1. A method for programming a transceiver, comprising:

accessing MDIO instructions that specify a first electrical specification for the transceiver;

executing the MDIO instructions to configure a programmable IO pad disposed on the transceiver;

sending or receiving data at the programmable IO pad in accordance with the first electrical specification; and

configuring a first programmable MDIO pad and the programmable IO pad to operate at different voltages.

2. The method of claim 1, wherein the configuring comprises:

receiving a first signal from a first pull-up or a first pull-down resistor to configure a first programmable MDIO pad.

3. The method of claim 2, further comprising:

receiving a second signal from a second pull-up or a second pull-down resistor to configure a second programmable MDIO pad, wherein the second programmable MDIO pad is configured to support a second electrical specification or data protocol, the second electrical specification different from the first electrical specification.

4. The method of claim 1, further comprising:

receiving instructions from one or more management chips to communicate with the transceiver.

5. The method according to claim 1, wherein the programmable IO port is a serial IO pad configured to communicate data in a serial format or a parallel IO pad configured to communicate data in a parallel format.

6. The method according to claim 5, wherein the serial IO port is configured to perform a parallel to serial conversion when data in the parallel format is received, and the parallel IO pad is configured to perform a serial to parallel conversion when data in the serial format is received.

7. The method according to claim 5, wherein the first programmable MDIO pad is configured to configure the serial IO pad and the parallel IO pad to comply with the first electrical specification.

8. A method for configuring a programmable pad for a protocol, comprising:

receiving, at a logic circuit coupled to the programmable pad, a first control signal having instructions for the protocol, wherein the protocol is associated with communication between the programmable pad and another pad;

executing, at the logic circuit, the instructions to implement the protocol; and

receiving, at the logic circuit, a second control signal having an instruction to determine a function of the programmable pad, the function one of an input and an output.

9. A system for configuring a programmable pad for a protocol, comprising:

the programmable pad; and

a logic circuit coupled to the programmable pad and configured to execute instructions to implement a protocol associated with communication between the programmable pad and another pad, the logic circuit having a first port, a second port, and a third port, the first port configured to receive a first control signal having the instructions, the second port configured to receive a second control signal having an instruction to cause the programmable pad to function as an input, and the third port configured to receive a third control signal having an instruction to cause the programmable pad to function as an output.

10. The system of claim 9, further comprising:

a control register configured to send the first control signal.

11. The system of claim 9, further comprising:

an input controller configured to send the second control signal.

12. The system of claim 11, further comprising:

an output controller configured to send the third control signal, the output controller separate from the input controller.

13. A method for reconfiguring a programmable pad from functioning as an output to functioning an input, comprising:

stopping receipt, at a logic circuit coupled to the programmable pad, of a first control signal having an instruction to cause the programmable pad to function as an output;

receiving, at the logic circuit, a second control signal having an instruction to cause the programmable pad to function as an input; and

executing, at the logic circuit, the instruction to cause the programmable pad to function as the input.

14. A system for reconfiguring a programmable pad from functioning as an output to functioning an input, comprising:

the programmable pad;

a logic circuit coupled to the programmable pad and configured to execute an instruction to cause the programmable pad to function as an input, the logic circuit having a first port and a second port, the first port configured to receive a first control signal having an instruction to cause the programmable pad to function as an output, and the second port configured to receive a second control signal having the instruction to cause the programmable pad to function as the input; and

a control register configured to generate a third control signal to stop transmission of the first control signal.

15. The system of claim 14, further comprising:

an output controller configured to control transmission of the first control signal to the first port.

16. The system of claim 14, further comprising:

an input controller configured to control, transmission of the second control signal to the second port, the input controller separate from the output controller.

17. The system of claim 16, further comprising:

a control register configured to send a third control signal to the input controller to cause the input controller to transmit the second control signal.

18. A transceiver, comprising:

a programmable input-output pad configured to support at least one of different electrical specifications, different data protocols, different timing protocols, and different input-output functions; and

a management data input/output pad programmable to configure, via an integrated circuit, the programmable input-output pad to comply with the different electrical specifications and the different data protocols.

19. The transceiver of claim 18, wherein the programmable input-output pad is programmable to operate as an input or an output.

20. A system to configure a programmable pad, comprising:

a logic circuit configured to

stop receipt of a first control signal having an instruction to cause the programmable pad to function as an output;

receive a second control signal having an instruction to cause the programmable pad to function as an input; and

execute the instruction to cause the programmable pad to function as the input.